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We present an ultra-broadband two-mode de/multiplexer based on a multimode interference coupler with sub-wavelength grating waveguides, a symmetric Y-junction and a 90° phase shifter. Numerical simulations show insertion losses below 0.18 dB and crosstalk lower than −20.6 dB in a 300 nm wavelength range.
We demonstrate a back end of line compatible SiN based material with tunable refractive index enabling low optical loss, high non-linear Kerr response, low index photonic crystals, high efficiency couplers, low loss waveguides and temperature tolerant MUX for DWDM.
The increasing demand for higher data rates and small form factor equipment for optical networks is fuelling research on integrated optical devices with small footprint and broad bandwidth. Here, we present novel design approaches for grating couplers in the silicon and silicon nitride platforms that enable broadband operation and highly efficient coupling. Furthermore, we report experimental findings...
We report our advances in development of subwavelength engineered metamaterial structures in silicon waveguides, specifically high-efficiency fiber-chip couplers, ultra-broadband surface grating couplers and nanophotonic beam splitters, evanescent field waveguide sensors and on-chip Fourier-transform spectrometers.
We report our advances in development of subwavelength engineered structures for integrated photonics, specifically high-efficiency fiber-chip couplers, broadband surface grating couplers and ultra-broadband nanophotonic beam splitters.
A review of passive and active photonic devices in three mid-IR silicon photonics material platforms suitable for communications and sensing, silicon on insulator (SOI), suspended silicon and germanium on silicon, is presented.
Demand for increasing data rates in long haul, access, and wireless transport will with no doubt rely on the increased capacity and flexibility of coherent optical communications. Development of high performance monolithically integrated coherent receivers will redound in cost reduction and contribute to the widespread use of this technology in all the aforementioned scenarios. In this communication...
Polarization management is a key functionality in many photonic applications including telecommunications, polarization diversity circuits and sensing, to name a few. Developing integrated circuits capable of reliably controlling polarization state would result in compact and low cost circuits with improved stability, compared with fiber or bulk optics solutions. Polarization rotators are a key building...
We report our advances in development of subwavelength engineered structures for integrated photonics. This unique technology allows synthesis of an effective photonic medium with an unprecedented control of material properties, constituting a powerful tool for a designer of photonic integrated circuits. By locally engineering the refractive index of silicon by forming a pattern of holes at the subwavelength...
Subwavelength engineering in silicon photonic integrated circuits is a powerful design tool that allows one to synthesize an effective photonic medium with adjustable refractive index. This creates a new degree of freedom in photonic circuit design. We present an overview of the fundamental concept and its application to address several important practical challenges in the implementation of silicon...
We report our recent advances in development of subwavelength engineered dielectric metamaterial structures for integrated photonics. By locally engineering the refractive index of silicon by forming a pattern of holes at the subwavelength scale it is possible to manipulate the flow of light in silicon nanophotonic waveguides [1], [2], [3], [4], [5], [6]. Specifically, we present a broadband fibre-chip...
A novel kind of Add/Drop Mode Division Multiplexer based on a Mach-Zehnder interferometer with SubWave-length Grating waveguides as arms is presented. The proposed device exhibits less than 1dB insertion loss and more than 20dB extinction ratio in the whole C-Band.
Mode-division multiplexing (MDM) is currently under study due to its potential to further increase data rates in optical communication circuits. In this paper, we propose an add/drop MDM for the first- and second-order modes that cover the whole C-Band (1.53–1.57 $\mu{\rm m} $) . The device is based on a Mach–Zehnder interferometer, including periodic waveguides in the arms. Mode selectivity is provided...
Silicon and germanium are transparent up to approximately 8 μm and 15 μm, respectively, thus offering a range of applications in biochemical and environmental sensing, medicine, astronomy and communications [1]. Silicon-on-insulator (SOI), can be used only up to 4 μm due to the high absorption loss of silicon dioxide, and therefore alternative material platforms have to be utilized for longer wavelengths...
We report our advances in development of subwavelength engineered waveguide structures. This unique NRC patented technology [1,2] allows synthesis of a metamaterial with an unprecedented control of material properties, constituting a powerful tool for a designer of photonic integrated circuits. We have demonstrated a number of subwavelength engineered devices operating at telecom wavelengths [3–7],...
We propose a 90 $^{\circ} $ hybrid-based monolithically integrated coherent receiver suitable for colorless operation in the complete C- and L-band (1530–1625 nm). In-phase and quadrature (IQ) signal components are obtained from a calibrated analog IQ recovery circuit, which adequately combines all the four photocurrents at the output of the 90 $^{\circ} $ hybrid nearly cancelling the baseband interference...
In this work, we present and analyze the ability of periodic SubWavelength Grating waveguides to act as mode filters. Moreover, we exploit this ability to design a novel kind of Add/Drop Mode Division Multiplexer exhibiting an extinction ratio over 20dB in the whole C-Band.
We demonstrate a monolithically integrated coherent receiver PIC on an InP substrate with a 120° optical hybrid and 40GHz pin-photodetectors. Moreover, the performance of the device for colorless detection of 28Gbaud 16-QAM signals in the C- and L-band is investigated.
A novel silicon photonics filter enabling single-channel-extraction over a wavelength range wider than the telecom C-band is proposed. An extraction bandwidth of only 15 GHz is demonstrated with off-band rejection of more than 15 dB.
Polarization control is essential in applications ranging from optical communications to interferometric sensors. The implementation of integrated polarization controllers is challenging as they require polarization rotating waveguides with stringent fabrication tolerances. Here, we present a fully integrated polarization controller scheme that significantly relaxes the requirements on the rotating...
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